A Longer Look at
Long-duration Energy Storage
Trying to compare
diferent types of
energy storage is a bit like
trying to compare the
color green to the color
blue. Here we take a stab
at defning the market
potential for long-
duration energy storage
and ofer considerations
for potential buyers of
this new technology.
JENNIFER RUNYON, Chief Editor
According to a recent report “Beyond Four Hours: The Transition to a More Flexible, and Valuable, Long-duration Energy Storage Asset,” 80 percent of market participants defne
long-duration energy storage (LDS) as an asset than can provide at least 3 hours of energy storage. But even that def-nition of LDS was not the same for everyone, according to
Jason Deign, author of the report.
“There really is a fair degree of uncertainty right now,” he
said, adding, “when you say long-duration storage the feld is
Deign interviewed energy project developers and key play-
ers at utilities to get a sense of what potential buyers of this
type of asset were thinking. He wanted to understand if and
how soon they would consider purchasing an LDS asset;
where they believed LDS already makes sense and where
it might make sense in the future; and what their concerns
might be about implementing the technology.
Deign began his survey by asking participants about what energy technology they
would consider for long-duration storage and
found the answers were also unclear.
“You have a lot of people saying they like
fow batteries” he said but added “we had
one guy say, ‘I hate fow batteries; I wouldn’t
“We had people saying thermal, cryo-
genic, and these are all really viable,” he
said. Deign said there is almost too much
choice out in the feld and not enough oper-
ating data to understand what works, how it
works and where.
“If you are looking to pick winners, it’s
really diffcult because you’re not just talk-
ing about different options within a given
technology group, there are actually differ-
ent technology groups. It’s not like saying Flow battery at Stone Edge Farm in Calif. Credit: ESS.